Hello and welcome to the forums, derpkitty. ^^
To answer your question... First get the URL of the picture you want to post. You can do this by right-clicking the image and clicking 'Copy Image URL'. Then when you're on this thread and want to post it, click the little Insert Image icon in the Message box, it's that little button with the mountain and the sun on it. Click that and then paste that image URL into the area it gives you.
Or, here's another way, you can post: [IMG]..insert image URL here..[/IMG]
I hope this helps! ^^

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